Adhesive casein and process of making same.



UNITED STATES PATEN am.

JOHN A. JUST, or SYRACUSE, NEW'YORK, Assienon O F oNE-HALFTo o. 1-1.

nusanrmaoommnmon LITTLEFALLS. NEW YORK, A FIRM.

'Ani'issws CASEIN AND PROCESS or MAKING SAME.

srncrrrcarrxon forming part of LettersPatent No. 692,460, dated February 4,190.

Application filed s in n, 1901.

ods of Making the Same, of which the'follou ing is a specification. p

I have discovered that casein or, a casein compound combined withan alkaline salt of tannic acid producesiii the presence of water a glue-like substance which possesses great adhesive power and which upon dryin-gassumes a hard and tough consistency and be comes insoluble in water and .variousother liquids; This adhesive casein can be produced from ordinary insoluble casein-for, instance, the curd of skim-milk-qr from a soluble casein .compound--forinstance, sodium casein-prepared from such curd. To produce this adhesive casein from ordinary insoluble casein, the latter is intimately mixed with an alkaline salt of 'tannic acid. I prefer a tannic' :5 salt of the alkaline earths or magnesia, and I it is advantageous to employ a salt whose w base is a solvent of. casein, since the excess of the base aids in forming the adhesive solution or substance. I prefer the tannate of calcium because it is cheap and easily prepared. The tannates of other alkaline earths, of magnesia, of fixed 'alkalies, of ammonia, of baryta, and other compounds of tannin or tannin-like substances may, however, be employed.

To niercial way, I prepare a solution containing tannic acid and then add lime, preferablyzin the form of milk of lime, in suflicientquantity to precipitate all the tannic acid and leave an'excess of lime. The solution of tan-- nic acid is conveniently made by boiling a bark containing tannic acid and straining the liquor. To the strained liquor is gradually added a clearsolution of milk of. lime.

untilno more precipitate resultsand the free liquor reacts alkaline. The solution of tannic acid may he warmed before adding the milk of lime; but this isnot essential. The so precipitate is separated from the liquid and dr preferably by an air-currentat ordiseen He. se.so1.- m peamntn nary tem perature,about 5 Fahrenheit. The.

, dry resulting ccmpound,'ivhich is essentially 'calcium tannate, is reduced to a powder, and if the latter does not contain-an excess of lime-I add'a suitable quantity of powdered lime. -The. casein or casein compound is'reduced'te a powder and intimately mixed with the powdered calcium'tannate. This can'be "conveniently effected by grinding the subtnre through a sieve. For most purposes a suitable proportion is one part of tannate to ten parts of casein; but this proportion may bmchanged materially as the peculiarities of ,the ultimate product may requifie.

be employed. This powderedmixture oficasein and tannate is ready for use as-an ad hesive by simply mixingit with water to the desired consistency. The casein is not pre "sive property. If desired, from ve 'to ten per cent. of ammonia may be added to the water which is added to the .powdered. m xformationof the viscous solution. Upon drytough, and insoluble in water,-- pe troleum, bisulfid of carbon, and many other liquids.

This adhesive casein can housed for a great variety of purposes. It can housed as an adhesive instead of gluefandother common adand therefore affords ample opportunity for by mixing it with water to a cream-like con sistency, adding glycerim'and then applying vas-or the paste may first be applied to the backing and then the g'lyerin maybe worked into the surface. The latter can be calenstances together and .then passing the. mix-T In some 'oases equal parts of tannate and casein may cipitatedupon adding the-water; ,but the mixture fo'rms,'with water, a glue-like viscous paste which possesses a very mar ed adhe-j;

\ture. Ammonia'facilitates and-expedites theing this viscous substance it becomes hard,"

hesives. It does not set or harden too quickly, produce this adhesive caseinin a commanipulating the parts or articles to which.

it is applied, and as it does not require to bei for barrels for various purposesfor instance,

the paste to a backing-for instance, of can dried warmed barrel, it strikes readily into flfered or embossed, Coloting' pigm'ents may I :added-. :.to the paste, i fdesired. In this IWjay a substitute for linoleum .can'be pro-- duoed wbichis suitable for cove'rin g floors and can-be washed with'soap and water.

{substance suitable for ;use"as a, poor con;

-- diwtor otheat may be made by mixing asor other suitable mineral or other fibrous orcommin'utedjsolid matter with the paste. About equal parts of mineral or fibrous platter-and casein compound will makea good This mixture can be put upon the market in a dry state and requires only to be mixed: with water for forming a non-conduct? in: paint 'or' aste suitable for direct applica- "tion tothe p pes or surfaces which are to be dryoompoun'd and water to'a puttyrlikecon aroduces upon drying anhorn-"li-ke,

tough -waterresisting substance.

bi an rotected and to which it adheres firmly. mmiunted mineral matter mixed with the sisten'cy Avatar-resisting paint may be made by mixingthe'adhesive-matter'with a suitable com- 7 This adhesive casein retards the setting o l'ninnted mineral matter anda coloring ma,tter. This paint may be sold as a dry powder and is preparedtor use by ,adding'cold water.

A diluted solution of this adhesive casein .forms an excellent sizefor wall-plaster preparatorytopainting. It possesses the impor- .tant advantage that it is-inot aliected bythe.

-moisture of wet walls. -Ail paints adhere firmly to this size plaster-of-paris and is therefore useful as a restrainer in plastering compositions. The casein compound may beradded to the water with which the .plaster-of-paris is mixed or to the dry chemical ingredieutsof a plaster-, ing composition.

-no value, as it-is produced inrvast quantities, 'for which-there is no market.

j I-claim'as my invention'. 7 ,5 1'. :The here'n-described com position of matter consisting of casein and an alkaline'salt v.qiflc anuic acidgsa'id composition forming with water an adhesive substance and becoming hard and water-resisting upon drying, substantially as set forth.

2. The herein-described emes of producin'gan adhesive substance from casein which consists in combining with casein an, alkaline salt of tannic acid and adding water, substantially as set forth.

. JOHN A. JUST. Witnesses;

EDWD. A. CONKEY," f DANIEL II. STRACHAN.

. 6d Witness my hand this 15th-day-of April, 1901.; 

